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 1 answerLast reply by: Jamal TischlerWed Jan 27, 2016 6:10 AMPost by werner dreesen on August 19, 2012what happens in a vacume and what happens if you keep V constant

### First Law of Thermodynamics

• Two objects are in thermal equilibrium if they do not exchange heat when in contact.
• Zeroth law of thermodynamics: If A and B are in thermal equilibrium with C, then A and B are in thermal equilibrium with each other.
• First law of thermodynamics: ΔU = Q + W, where ΔU is the change in internal energy of a system, Q is the amount of heat added, and W is the work done ON the system. Q > 0 if heat is added, and Q < 0 if heat is removed.
• Another version of the first law: ΔU = Q – W, where W is the work done BY the system.
• If a process undergone by a system is represented on a P-V diagram, then the work by the system in going from the state represented by point A to the state represented by point B is the area under the curve connecting A to B.

### First Law of Thermodynamics

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Zeroth Law of Thermodynamics 0:09
• Two Objects in Contact
• Thermometer in Thermal Equilibrium (Exchanged Energy)
• First Law of Thermodynamics 6:06
• Monatomic Ideal Gas
• Internal Energy
• Change in Internal Energy of System
• Work Done on a Gas 22:29
• Cylinder with Frictionless Piston
• Displacement of Piston
• Under Constant Pressure
• Work Done by Gas
• Example 35:29
• Ideal gas, Monatomic Expands Isobarically
• Isobaric: Process at Constant Atmospheric Pressure
• Work Done By Gas
• Example 2 47:19
• Steam
• Cylinder with Steam
• Work Done By Gas
• Change in Internal Energy of System
• Extra Example 1: Gas Expanding Isobarically
• Extra Example 2: Block of Aluminum
• Extra Example 3: Gas in Piston